It seems that if I have items with solid colors (no texture) inside of SketchUp, all the colors end up being marked as the same "White" defuse color inside of Unity.
Also the light map isn't importing when this happens. If I export lighting only I do get a lightmapped clay model.

I had no issues with the script on a previous project which has far more texture and solid colors.
This is a project for a client I would appreciate a quick response.

OK, that doesn't seem to be happening anymore, but I am now having another problem where everything appears transparent and z-sorted incorrectly.

Sometimes.

Here's a screenshot where I exported two sketchup scenes (the house and the colored boxes). The house imports weird, and the boxes import fine. Examining them, I see that the house is using the Lightup lightmapped shader, and the boxes are using the legacy lightmapped shader.

Sorry for resurrecting an old thread, but seems the most logical place...

Given the age of this script, is it still appropriate to use in the workflow pipeline for current Sketchup 2015/LightUp 4/Unity 4 (or 5) versions?

It looks like you've included a custom shader in your script (I think)... Unity has improved many of the shaders since you originally worked on this. Is it still appropriate to use your custom shader? Or, is there a better native option in Unity?